package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.sky.constant.MessageConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.UserMapper;
import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;

@Service
@Slf4j
public class UserServiceImpl implements UserService {
	
	//微信服务接口地址
	public static final String WX_LOGIN = "https://api.weixin.qq.com/sns/jscode2session";
	
	@Autowired
	private WeChatProperties weChatProperties;
	@Autowired
	private UserMapper userMapper;
	
	/**
	 * 微信登录
	 * @param userLoginDTO
	 * @return
	 */
	public User wxLogin(UserLoginDTO userLoginDTO) {
		String openid = getOpenid(userLoginDTO.getCode());
		
		//判断openid是否为空，如果为空表示登录失败，抛出业务异常
		if(openid == null){
			throw new LoginFailedException(MessageConstant.LOGIN_FAILED);
		}
		
		//判断当前用户是否为新用户
		User user = userMapper.getByOpenid(openid);
		
		//如果是新用户，自动完成注册
		if(user == null){
			user = User.builder()
					.openid(openid)
					.createTime(LocalDateTime.now())
					.build();
			userMapper.insert(user);//后绪步骤实现
		}
		
		//返回这个用户对象
		return user;
	}
	
	/**
	 * 调用微信接口服务，获取微信用户的openid
	 * @param code
	 * @return
	 */
	private String getOpenid(String code){
		//调用微信接口服务，获得当前微信用户的openid
		Map<String, String> map = new HashMap<>();
		map.put("appid",weChatProperties.getAppid());
		map.put("secret",weChatProperties.getSecret());
		map.put("js_code",code);
		map.put("grant_type","authorization_code");
		String json = HttpClientUtil.doGet(WX_LOGIN, map);
		
		JSONObject jsonObject = JSON.parseObject(json);
		String openid = jsonObject.getString("openid");
		return openid;
	}
}
